From de0c0d75b30af4a8f264b9aefc7ae6c6e76525b1 Mon Sep 17 00:00:00 2001
From: Stephen J Day <stephen.day@docker.com>
Date: Fri, 23 Mar 2018 12:31:00 -0700
Subject: [PATCH] agent: backoff session when no remotes are available

Signed-off-by: Stephen J Day <stephen.day@docker.com>
---
 agent/session.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/agent/session.go b/agent/session.go
index 9bb9773a6c..8606eab392 100644
--- a/agent/session.go
+++ b/agent/session.go
@@ -67,7 +67,14 @@ func newSession(ctx context.Context, agent *Agent, delay time.Duration, sessionI
 	)
 
 	if err != nil {
-		s.errs <- err
+		// since we are returning without launching the session goroutine, we
+		// need to provide the delay that is guaranteed by calling this
+		// function. We launch a goroutine so that we only delay the retry and
+		// avoid blocking the main loop.
+		go func() {
+			time.Sleep(delay)
+			s.errs <- err
+		}()
 		return s
 	}